CVE-2026-27858

Name
CVE-2026-27858
Description
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security@open-xchange.com https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:13498
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:13830
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:13857
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:17602
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:17625
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:17626
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:17628
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:17630
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:18053
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:19149
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:19364
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:19453
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:19455
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/errata/RHSA-2026:26564
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://access.redhat.com/security/cve/CVE-2026-27858
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://bugzilla.redhat.com/show_bug.cgi?id=2452175
0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27858.json

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* dovecot >= None < 2.4.3
cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:* dovecot >= None < 2.3.22.1
cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:* dovecot >= 3.0.0 < 3.0.5
cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:* dovecot >= 3.1.0 < 3.1.4

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
dovecot edge-main 2.4.2-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.2-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.1-r3 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.4.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.3.21.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.3.19.1-r6 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.3.19.1-r5 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.3.15-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot edge-main 2.3.13-r0 None possibly vulnerable
dovecot edge-main 2.3.11.3-r0 None possibly vulnerable
dovecot edge-main 2.3.10.1-r0 None possibly vulnerable
dovecot edge-main 2.3.9.3-r0 None possibly vulnerable
dovecot edge-main 2.3.9.2-r0 None possibly vulnerable
dovecot edge-main 2.3.7.2-r0 None possibly vulnerable
dovecot edge-main 2.3.6-r0 None possibly vulnerable
dovecot edge-main 2.3.5.1-r0 None possibly vulnerable
dovecot edge-main 2.3.4.1-r0 None possibly vulnerable
dovecot edge-main 2.3.1-r0 None possibly vulnerable
dovecot 3.23-main 2.4.2-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot 3.22-main 2.4.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot 3.22-main 2.3.21.1-r0 None possibly vulnerable
dovecot 3.22-main 2.3.19.1-r5 None possibly vulnerable
dovecot 3.22-main 2.3.15-r0 None possibly vulnerable
dovecot 3.22-main 2.3.13-r0 None possibly vulnerable
dovecot 3.22-main 2.3.11.3-r0 None possibly vulnerable
dovecot 3.22-main 2.3.10.1-r0 None possibly vulnerable
dovecot 3.22-main 2.3.9.3-r0 None possibly vulnerable
dovecot 3.22-main 2.3.9.2-r0 None possibly vulnerable
dovecot 3.22-main 2.3.7.2-r0 None possibly vulnerable
dovecot 3.22-main 2.3.6-r0 None possibly vulnerable
dovecot 3.22-main 2.3.5.1-r0 None possibly vulnerable
dovecot 3.22-main 2.3.4.1-r0 None possibly vulnerable
dovecot 3.22-main 2.3.1-r0 None possibly vulnerable
dovecot 3.21-main 2.3.21.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot 3.21-main 2.3.19.1-r5 None possibly vulnerable
dovecot 3.21-main 2.3.15-r0 None possibly vulnerable
dovecot 3.21-main 2.3.13-r0 None possibly vulnerable
dovecot 3.21-main 2.3.11.3-r0 None possibly vulnerable
dovecot 3.21-main 2.3.10.1-r0 None possibly vulnerable
dovecot 3.21-main 2.3.9.3-r0 None possibly vulnerable
dovecot 3.21-main 2.3.9.2-r0 None possibly vulnerable
dovecot 3.21-main 2.3.7.2-r0 None possibly vulnerable
dovecot 3.21-main 2.3.6-r0 None possibly vulnerable
dovecot 3.21-main 2.3.5.1-r0 None possibly vulnerable
dovecot 3.21-main 2.3.4.1-r0 None possibly vulnerable
dovecot 3.21-main 2.3.1-r0 None possibly vulnerable
dovecot 3.20-main 2.3.21.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot 3.20-main 2.3.19.1-r5 None possibly vulnerable
dovecot 3.20-main 2.3.15-r0 None possibly vulnerable
dovecot 3.20-main 2.3.13-r0 None possibly vulnerable
dovecot 3.20-main 2.3.11.3-r0 None possibly vulnerable
dovecot 3.20-main 2.3.10.1-r0 None possibly vulnerable
dovecot 3.20-main 2.3.9.3-r0 None possibly vulnerable
dovecot 3.20-main 2.3.9.2-r0 None possibly vulnerable
dovecot 3.20-main 2.3.7.2-r0 None possibly vulnerable
dovecot 3.20-main 2.3.6-r0 None possibly vulnerable
dovecot 3.20-main 2.3.5.1-r0 None possibly vulnerable
dovecot 3.20-main 2.3.4.1-r0 None possibly vulnerable
dovecot 3.20-main 2.3.1-r0 None possibly vulnerable
dovecot 3.19-main 2.3.21-r17 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
dovecot 3.19-main 2.3.19.1-r5 None possibly vulnerable
dovecot 3.19-main 2.3.15-r0 None possibly vulnerable
dovecot 3.19-main 2.3.13-r0 None possibly vulnerable
dovecot 3.19-main 2.3.11.3-r0 None possibly vulnerable
dovecot 3.19-main 2.3.10.1-r0 None possibly vulnerable
dovecot 3.19-main 2.3.9.3-r0 None possibly vulnerable
dovecot 3.19-main 2.3.9.2-r0 None possibly vulnerable
dovecot 3.19-main 2.3.7.2-r0 None possibly vulnerable
dovecot 3.19-main 2.3.6-r0 None possibly vulnerable
dovecot 3.19-main 2.3.5.1-r0 None possibly vulnerable
dovecot 3.19-main 2.3.4.1-r0 None possibly vulnerable
dovecot 3.19-main 2.3.1-r0 None possibly vulnerable